If a case then had decided point of law it will be logical that kind of explanation will look in the future. Therefore the law does not have essentially differently.
The doctrine of judicial precedent is based on the principle of stare decisis, meaning 'to stand by what has been decided'. Under this doctrine, legal decisions made by judges in higher courts set a precedent for judges in equal or lower courts to follow, whereby lower courts are bound to apply the legal principles set down by superior courts in earlier cases and appellate courts follow their own previous decision. Judicial precedent can applied on cases and to be treated similar when the material facts of the cases are identical.
There are two principles that are involved in judicial precedent. There are ratio decidendi and the obiter dictum. The binding part of a previous decision is the ration decidendi (reason for the decision) and it must be followed by judges in later cases. Anything said an obiter dictum (by the way) in the original case is merely persuasive because it was not strictly relevant to the matter in issue and does not have to be followed. For example:
In Donoghue v Stevenson, the claimant suffered food poisoning after drinking from an opaque bottle of ginger beer which contained a dead, decomposing snail. The House of Lords held that a manufacturer owed a duty of care to the consumer that products are safe because the circumstances prevented the consumer from discovering any